If \({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{1}{{\sqrt 5 }}} \right) = {\rm{\theta }}\), then what is the value of \({\rm{cose}}{{\rm{c}}^{ - 1}}\left( {\sqrt 5 } \right)?\)

1
\(\left( {\frac{{\rm{\pi }}}{2}} \right) + {\rm{\theta }}\)
2
\(\left( {\frac{{\rm{\pi }}}{2}} \right) - {\rm{\theta }}\)
3
\(\frac{{\rm{\pi }}}{2}\)
4

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